Rubinstein

Akiba Rubinstein ranked among the world's strongest players from 1907 into the early 1920s. His outstanding year was 1912, when he won four major events: San Sebastián, Vilnius, Breslau, and Piešťany. For a short period he may have been the strongest active player.

A match for the World Championship against Emanuel Lasker appeared likely, but it never took place, and the First World War transformed the competitive landscape. Rubinstein is therefore often included among the greatest players who came close to the title without holding it.

His practical influence is especially clear in opening theory and rook-and-pawn endings. An endgame is the phase in which relatively few pieces remain. In these endings, active kings and rooks, passed pawns, and the exact timing of exchanges often matter more than an immediate attack. Rubinstein's games are still studied as models of converting small advantages through precise moves.